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Noun: bad boy
Usage: informal
  1. A rebellious man who does not conform to usual standards or behaviour
    "self-described bad boy of Wall Street stands trial"
  2. [US, informal] Something impressive or powerful (esp. a car or motorbike)
    "can't wait to take this bad boy for a spin"

Derived forms: bad boys

Type of: nonconformist, recusant

Encyclopedia: Bad boy